Help Mix Source v15 + v16

[lionheart0708]

its is posible to mix v15 + v16

what is the best software to mix this source with no problem

for example i want to add

#define __NEW_WEAPON_GLOW

how to find this source the other file

what is best way

i hope u help me guys
actually from now i use winmerge

 

[Ketchup]

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